periodic table

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Across
  1. 4. dull
  2. 6. average mass of an atom
  3. 8. conductive
  4. 9. prevents electrivity or heat
  5. 10. a row of the periodic table
Down
  1. 1. column of elements
  2. 2. table the chart of elements
  3. 3. the most reactive nonmetal elements are in group 17 of the periodic table
  4. 5. element that is both metal and nonmetal
  5. 7. breaks easily